How can I change characteristic(service,Rx,Tx) UUID ?

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Jim — Sun, 10 Jun 2018 02:44:21 GMT

I'm really thank you!! Vidar Berg!!

I solved the problem with your help .

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Vidar Berg — Fri, 08 Jun 2018 09:37:05 GMT

RAM_START_ADDRESS should not be changed, it's used to calculate the total RAM area. Configuration of the application RAM address is done in "options for target":

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Jim — Fri, 08 Jun 2018 09:28:42 GMT

I use Keil (uVision5).

I found RAM start address (0x20000000). I changed this value, but it was not resolved.

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Vidar Berg — Fri, 08 Jun 2018 08:27:23 GMT

Do you have debug logging enabled? It should print out the lowest RAM address you can use with current configuration. Alternatively, just increase the RAM start address by ~20 bytes or more, enough to store the new base UUID. Just let me know what toolchain/IDE you use if you are unsure on how you can do this.

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Jim — Fri, 08 Jun 2018 08:02:40 GMT

static void ble_stack_init(void)
{
    uint32_t err_code;

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    // Initialize SoftDevice.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);
    ble_enable_params.common_enable_params.vs_uuid_count = 2;//Allocate buffer space for 128-bit base UUIDs
    //Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);

    // Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
    ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Subscribe for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}

As a result of modifying the above code, it will not advertise.
Which part am I doing wrong?

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Vidar Berg — Fri, 08 Jun 2018 06:49:33 GMT

Sorry, sdk_config.h did not include stack configurations in earlier SDK versions, believe it was introduced in SDK 13.

You can set the UUID count in ble_stack_init():

static void ble_stack_init(void)
{
    uint32_t err_code;

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    // Initialize the SoftDevice handler module.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(NRF_BLE_CENTRAL_LINK_COUNT,
                                                    NRF_BLE_PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);
    
    ble_enable_params.common_enable_params.vs_uuid_count = //Allocate buffer space for 128-bit base UUIDs

Note: this will increase the softdevice's RAM usage which may require you to increase the APP ram start address in your linker configuration. See debug log for details.

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Jim — Thu, 07 Jun 2018 23:33:01 GMT

I checked, but I did not find NRF_SDH_BLE_VS_UUID_COUNT in sdk_config.h.

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Vidar Berg — Thu, 07 Jun 2018 11:18:45 GMT

PHERIPHERAL_LINK_COUNT defines the number of concurrent peripheral links you can have. So is not related to the error you got.

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Jim — Thu, 07 Jun 2018 11:13:39 GMT

Thank you for your answer!

Didn't I have to change PHERIPHERAL_LINK_COUNT?

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Vidar Berg — Thu, 07 Jun 2018 11:03:23 GMT

Hi,

0x4 corresponds to NRF_ERROR_NO_MEM (defined in nrf_error.h), which means that the softdevice does not have enough buffer space to store the 128-bit UUID base. Increasing NRF_SDH_BLE_VS_UUID_COUNT in sdk_config.h should fix this.

Best regards,

Vidar

RE: How can I change characteristic(service,Rx,Tx) UUID ?

Jim — Thu, 07 Jun 2018 10:40:14 GMT

sd_ble_uuid_vs_add(&base_uuid, &char_uuid.type) return 0x04.

Below is ble stack initial function.

#define CENTRAL_LINK_COUNT              0                   
#define PERIPHERAL_LINK_COUNT           1                   

static void ble_stack_init(void)
{
    uint32_t err_code;

    nrf_clock_lf_cfg_t clock_lf_cfg = NRF_CLOCK_LFCLKSRC;

    // Initialize SoftDevice.
    SOFTDEVICE_HANDLER_INIT(&clock_lf_cfg, NULL);

    ble_enable_params_t ble_enable_params;
    err_code = softdevice_enable_get_default_config(CENTRAL_LINK_COUNT,
                                                    PERIPHERAL_LINK_COUNT,
                                                    &ble_enable_params);
    APP_ERROR_CHECK(err_code);

    //Check the ram settings against the used number of links
    CHECK_RAM_START_ADDR(CENTRAL_LINK_COUNT,PERIPHERAL_LINK_COUNT);

    // Enable BLE stack.
#if (NRF_SD_BLE_API_VERSION == 3)
    ble_enable_params.gatt_enable_params.att_mtu = NRF_BLE_MAX_MTU_SIZE;
#endif
    err_code = softdevice_enable(&ble_enable_params);
    APP_ERROR_CHECK(err_code);

    // Subscribe for BLE events.
    err_code = softdevice_ble_evt_handler_set(ble_evt_dispatch);
    APP_ERROR_CHECK(err_code);
}